字
ジ, あざ, あざな, な

character, letter, word, section of village

JLPT4 G1 S6 F485

子# child/offspring + 宀 roof/building → place in which to *raise* and increase the number of children* → *character* (← make one character after another by combining different elements) → *letter* → *small administrative unit* of a town/village (← small unit ← letter/character as one unit of a whole).

[Full Kanji Etymology List]